HP Color LaserJet 9500 Printer series - Manual (Page 19)

ENWW Interpreting control panel lights 17
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Interpreting control panel lights
Light State Indication
Ready Off The printer is off or offline, or has experienced an error.
On The printer is ready to print.
Blinking The printer is going offline; please wait.
Data Off The printer has no data to print.
On The printer has data to print, but is not ready or is offline.
Blinking The printer is processing or is printing the data.
Attention Off The printer is functioning without error.
On The printer has experienced a critical error. Note the error message, and
then turn the printer off and then on again.
Blinking Action is required. See the control panel display.